#include <iostream>
using namespace std;

class Test {
  private:
    int a;

  public:
    Test(int x = 0) : a(x) {} // 将a初始化为x
    void Show() const { cout << "a:" << a << endl; }
};

int main() {
    Test obj(168);
    obj.Show();

    return 0;
}
